[Mac] Refactor location-bar autocomplete cell classes.

chrome/browser/cocoa/autocomplete_text_field_editor.mm

+// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import "chrome/browser/cocoa/autocomplete_text_field_editor.h"
+
+#include "base/string_util.h"
+#include "base/sys_string_conversions.h"
+
+@implementation AutocompleteTextFieldEditor
+
+- (void)copy:(id)sender {
+  NSPasteboard* pb = [NSPasteboard generalPasteboard];
+  [self performCopy:pb];
+}
+
+- (void)cut:(id)sender {
+  NSPasteboard* pb = [NSPasteboard generalPasteboard];
+  [self performCut:pb];
+}
+
+- (void)performCopy:(NSPasteboard*)pb {
+  [pb declareTypes:[NSArray array] owner:nil];
+  [self writeSelectionToPasteboard:pb types:
+      [NSArray arrayWithObject:NSStringPboardType]];
+}
+
+- (void)performCut:(NSPasteboard*)pb {
+  [self performCopy:pb];
+  [self delete:nil];
+}
+
+@end